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Dicamba Discussion (05/24/18)

I know you have heard the concerns about dicamba a hundred times. I am not going to restate everything that has been covered over the winter, but I wanted to point out a couple things that came up as a few of us were having a discussion about dicamba this morning specifically related to use in Xtend soybean.

Dicamba Discussion

I know you have heard the concerns about dicamba a hundred times. I am not going to restate everything that has been covered over the winter, but I wanted to point out a couple things that came up as a few of us were having a discussion about dicamba this morning specifically related to use in Xtend soybean.

Prioritize activity to facilitate good stewardship. The list of things to consider for application of Engenia, Xtendimax, or Fexipan is long. The environmental restrictions for legal use of these products confines these applications into a narrow window. Be ready to spray these products when conditions are favorable. Most other activities can be delayed a few hours or a day or two without ill effects.

Consider the overall weed control program. I have already visited with individuals who have glyphosate-resistant kochia established in fields at seeding. They might need the dicamba PRE to kill the kochia, it would work quite well. But the early POST timing might provide a better benefit in many situations. The residual control window of dicamba is relatively short. An early POST timing to small weeds will control the early flush and give that residual benefit further into the growing season, closer to canopy closure when the crop can help maintain the field.

One reason to bring up the delay of dicamba application to POST timing leads back to the environmental restrictions. This time of year we might struggle to fit spray activities around wind and rain. But we don’t often pay attention to the temperature, although we have experienced a few days of rather summerlike weather. As noted this morning, the forecast highs in the next several days exceed the 85 F limit for application of these dicamba products. Granted, there are not many soybean out of the ground to be affected, but there are several other plants that could show symptoms of dicamba movement. I would be very disappointed if my cherry, apple, and lilac blossoms, that are just starting to open, puckered up and turned brown.

Kirk Howatt

NDSU Weed Scientist

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